From: Robert Klemme <bob.news@...>
Date: 2004-12-10T21:27:25+09:00
Subject: Re: adding object attributes


"David A. Black" <dblack@wobblini.net> schrieb im Newsbeitrag
news:Pine.LNX.4.61.0412100332320.5050@wobblini...

> What you want to do is use attr_accessor -- but, as you say, not in
> 'A', but rather in the singleton class of 'b'.  You would do this like
> this:

Alternatively Artur can use OpenStruct, where you can add attributes even
more dynamic:

:25:55 [source]: irbs -r ostruct
>> a = OpenStruct.new([:a])
=> <OpenStruct a=nil>
>> a.a
=> nil
>> a.dummy = "hello world"
=> "hello world"
>> a.dummy
=> "hello world"

You can even inherity OpenStruct, if you want to add additional methods:

>> class A < OpenStruct
>> def my_method() puts "buh!" end
>> end
=> nil
>> a=A.new
=> <A>
>> a=A.new [:a]
=> <A a=nil>
>> a.my_method
buh!
=> nil
>> a.dummy = "hello"
=> "hello"
>> a.dummy
=> "hello"
>> a
=> <A a=nil dummy="hello">

Or you use a hash - that might be appropriate in some circumstances, too.

Kind regards

    robert